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Credit Card or similar Authentication would be feasible surely.
Input a card number. That number is intrinsically linked, and through AVS can be positively linked to the address of the account holder. Makes tracking someone down easier.
If the card is then reported as stolen, MSN disable the account until a new card is input.
I know children don't have cards, but their parents cards could be used. The parent could then be forced through a set of parental control pages to ensure that the child is only accessing groups they approve of.
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